Sven jonsson



(No Model.)

y S. JONSSON.

DEVIOETOR TRANSMITTING ROTARY MOTION. Y No, 320,437'. Patented June 16, 1885.

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.Attorneys UNITED STATES PATENT OFFICE.

SVEN JONSSON, OF OOPENHAGEN, DENMARK, ASSIGNOR TO BURMEIS'IEB & VVAINS MASKIN, OG SKIBSBYGGERI, OF SAME PLACE.

DEVICE FOR TRANSNHTTING ROTARY MOTION.

SPECIFICATION forming part of Letters Patent No. 320,437, dated June 16, 1885.

Application mail my 4, i885, (No model.)

To @ZZ whom, if; may concern:

Beit kllowll that I, SVEN JNSSON, a subject of the Klug of Denmark, residing at Oopellhagen, ill the Kingdom of Denmark, have invented certaill new and useful Improvements ill Devices for Transmitting Rotary Motion; alld I do hereby declare the following to be a full, clear, and exact descriptioll of the illven tion, such as will enable others skilled ill the lo art to wllich it appertains to make alld use the sallle, reference being had to the accolnpanying drawings, which form a part of tllis specification, alld ill which- Figure l is a longitudinal vertical sectional view of my improved device for transmitting' rotary lnotion, taken on the line zr .c in Fig. 2 of the drawings. Fig. 2 is a horizontal trailsverse sectiollal view taken on the lille y y in Fig. 1, alld Figs. 3 alld 4 are sectional views 2o illustrating certain modifications of the invention.

rIlle'salne letters refer to the same parts in all the igules.

This illventioll relates to all improved device for transmitting rotary motion; and it has for its object to so collstruct the same that, ill case the part to whicll the mot-ion is trans lllitted shall attain too high a rate of speed, the translllitter sllall be antonlaticall y thrown 3o out of action and be alltolnatically restored to its operative position wllell the speed has been sufficiently slackeued by the resistallce of the parts which are being operated.

XVith tllese ends in view the invention consists ill the improved construction, arrange lnellt, and combination of parts, which will be hereinafter fully described, alld particularly poillted out in the claims.

In the drawings hereto annexed, A desig- 40 nates a shaft, on which is fixed a wheel or pulley, B, receiving its motion froln any sllitable power.

O is a balld-whecl lnoullted loosely upon the shaft A, and collsisting of a disk, E, rim or lflange F, and hub G, which latter is surrouuded by a laterali y-extendin g tlan ge, H, of

the pulley B.`

To the inner side of the disk E of band wheel O, near the periphery of the latter, are 5o pivoted a pair of arms, I I, either upon a colnnlon or on separate pivoting-pins, J J, which said arms are provided with curved portiolls K K, illclosillg the ilange H of the pulley B, and provided with teeth or serrations bearillg against the said liange. rIhe curved toothed portions of the said arlns are increased ill thickness, for the dollble purpose ot' causing the teeth to bite more effectively against the [lange H and ill order to give tlleln additional weight, to increase the celltrifugal power, whereby they will be tllrowll ill anontward direction and out of engagement with the flange H. of pulley B when the speed of rota# tioll exceeds a certain lilnit.

lIhe free ends of the arms I I are provided with transverse openings or eyes L L, tllrougll which passes a collllecting-bolt, M, between the head or llllt of which and the free end of the adjoining arnl I is placed a coiled spring, O, by nleans of which the free ends of the said 7o arms I I will be forced toward each other, thus causing the curved serrated portiolls of the said arms to grasp the flange H of pulley B with a degree of tension which nlay be regulated by loosening or tightening the nut N of the bolt M as occasion lllay demand.

In order to prevent either one of the arms I from lllovllg outwardly suddellly by centrifugal force, and thereby so straining the spring O as to prevent the release ofthe other arm I 8O from its bite upon the 'flange H of pulley B, I provide the disk E ot' the band wheel with a pair of stop-studs, I P, located so closely to the arms I I that the latter lnay swing ill all outward direction merely sufficiently to bring their serrated edges out of contact with the flange H of pulley B.

The operatioll of this illventioll will be readily ullderstood from the foregoing description, taken ill connection with the drawings hereto 9o annexed. Power being applied to the pulley B, the latter will, through the arms I I, impart a rotary motion to the band-wheel C, from whence it is transmitted to the machinery to be driven. When the speed exceeds a given 9 5 rate, which is regulated by the tellsion of the spring O, the arms I I will by the centrifllgal force thus exerted be caused to release their hold upon the flange H of pulley B, thus disconnecting saidpulley from the band-wheel 10o until the speed ofthe latter, bythe resistance of the machinery driven thereby, is so slack- Acase arranged in a transversely perforar ed 'the bami-wheel C; or, as shown in Fig. 4,

cned as to enable the tension of the spring 0 to overcome the centrifugal force, when the arms I I will again be broug'ht into contact with the tlange H, and the operation will proceed as before.

It is obvious that this device ina-y be subjected to numerous structural changes without departing from the spirit of the invention. Thus, as will be seen in Fig. 3 of the drawings, a single arm I maybe employed in lieu of a pair, one end ot' the bolt M being in such lug, Q, upon the inner side of the disk E of the arms I I may be omitted, and replaced by a block, '1, or a series of two or more such blocks, having concaveserrated inner sides or elges adapted to bear against the iiange H, and provided with screw-threaded stems S, arranged to slide radially in suitable guidestuds, T, upcn the duk E. A spring, U, is arranged upon the stem S between the outer bearing, T, and anut, V, adjustable upon the said stem, and by means ot' which the tension ot' the spring may be regulated.

The operation of this device will be obvious when reference is had to the foregoing description.

I would have it understood that I reserve to myself the right to these and to all other modifications which may be resorted to without departing from the spirit of my invention.

Having thus described myinvention, I. claim and desire to secure by Letters Patent ot' the United Statesi 1. A device for the transmission ot rotary motion, consisting ot' friction devices arranged to engage a flanged pulley until thc speed of rotation exceeds a certain limit, when, by the centrifugal action thus produced, they shall be thrown out of engagement, substantially as herein described, for the purpose shown and specified.

2. In a device for transmitting rotary ino4 tion, the combination of a lixed pulley, a loose bandwvheel adjoining the same, friction de-v vices pivoted or arranged to slide radially upon the side of the baud-wheel adjoining the i pulley, and adapted to engage the latter, or a l flange extending laterally therefrom, a spring or springs arranged to force the said friction devices into contact with the pulley or its flange, and means for regulating the tension ofthe said spring or springs, substantially as and for the purpose herein set forth.

3. In a device for transmitting rotary motion, the combination, with a shaft, of afixed pulley, a loose band-wheel adjoining the saine, a pair of arms pivoted to the said band-wheel and adapted to bear against the sides ot' the said pulley, a bolt connecting the free ends of the said arms, and a spring arranged between the free end of one of said arms and the head or nut ot' the said bolt, substantially as and for the purpose set forth.

4. In a device for transmitting rotary motion, the combination, with a shaft, ot' a fixed pulley, a loose band-wheel adjoining the same, a pair of arms pivoted to the said band-wheel, and having concave, thickened, orre-enforced serrated portions adapted to bear against the said pulley, and a spring or springs arranged to force the said arms into contact with the said pulley, substantially as and for the purpose set forth.

In a device for transmitting rotary motion, a loose band-wheel having a pair of pivoted arms adapted to bear frictonall y against the sides ot' a fixed pulley adjoining the said band-wl1eel, a spring mounted upon a bolt connecting the free ends of the said arms between one of said arms and the head or nut of said bolt, and acting to force the said arms into frictional contact with the pulley, and stop-studs arranged upon the face of thc bandwheel to'prevent the outward movement of the pivoted arms more than sufficiently to release their bite upon the pulley when the centrifugal power acting upon the said arms shall overcome thc tension ot' the spring, substantially as and for the purpose herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SVEN JONSSON.

Witnesses:

FREDERIK WoLFr, EMIL HANSEN. 

